Note that I'm not conceding anything by what I said above or to Tim. Ethernet that also carries power is 725. Plain old Ethernet is 800.
-Hal
Both are 725.
725.121 Power Sources for Class 2 and Class 3 Circuits.
(A) Power Source. The power source for a Class 2 or a Class 3
circuit shall be as specified in 725.121(A)(1), (A)(2), (A)(3),
(A)(4), or (A)(5):
Informational Note No. 1: Informational Note Figure 725.121,
No. 1 illustrates the relationships between Class 2 or Class 3
power sources, their supply, and the Class 2 or Class 3 circuits.
Informational Note No. 2: Table 11(A) and Table 11(B) in
Chapter 9 provide the requirements for listed Class 2 and
Class 3 power sources.
(1) A listed Class 2 or Class 3 transformer
(2) A listed Class 2 or Class 3 power supply
(3) Other listed equipment marked to identify the Class 2 or
Class 3 power source
Exception No. 1 to (3): Thermocouples shall not require listing as a
Class 2 power source.
Exception No. 2 to (3): Limited power circuits of listed equipment where
these circuits have energy levels rated at or below the limits established
in Chapter 9, Table 11(A) and Table 11(B).
Informational Note: Examples of other listed equipment are as
follows:
***
(4) Listed audio/video information technology (computer),
communications, and industrial equipment limited-power
circuits.
Informational Note: One way to determine applicable
requirements for listing of information technology
(computer) equipment is to refer to UL 60950-1-2011,
Standard for Safety of Information Technology Equipment.
Another way to determine applicable requirements for
listing of audio/video, information and communication
technology equipment is to refer to UL 62368-1-2014,
Safety of audio/video, information and communication technology
equipment. Typically such circuits are used to interconnect
data circuits for the purpose of exchanging
information data. One way to determine applicable
requirements for listing of industrial equipment is to refer
to UL 61010-2-201, Safety requirements for electrical equipment
for measurement, control, and laboratory use –Part 2-201:
Particular requirements for control equipment, and/or
UL 61800-5-1, Adjustable speed electrical power drive systems –
Part 5-1: Safety requirements –Electrical, thermal and energy.